/*
* FLINT PARTICLE SYSTEM
* .....................
* 
* Author: Richard Lord
* Copyright (c) Richard Lord 2008-2011
* http://flintparticles.org
* 
* 
* Licence Agreement
* 
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* 
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

package org.flintparticles.twod.renderers;

import nme.geom.Rectangle;
import org.flintparticles.twod.particles.Particle2D;

/**
 * The PixelRenderer draws particles as single pixels on a Bitmap display object. The
 * region of the particle system covered by this bitmap object must be defined
 * in the canvas property of the PixelRenderer. Particles outside this region
 * are not drawn.
 * 
 * <p>The PixelRenderer allows the use of BitmapFilters to modify the appearance
 * of the bitmap. Every frame, under normal circumstances, the Bitmap used to
 * display the particles is wiped clean before all the particles are redrawn.
 * However, if one or more filters are added to the renderer, the filters are
 * applied to the bitmap instead of wiping it clean. This enables various trail
 * effects by using blur and other filters. You can also disable the clearing
 * of the particles by setting the clearBetweenFrames property to false.</p>
 * 
 * <p>The PixelRenderer has mouse events disabled for itself and any 
 * display objects in its display list. To enable mouse events for the renderer
 * or its children set the mouseEnabled or mouseChildren properties to true.</p>
 */
class PixelRenderer extends BitmapRenderer
{
	/**
	 * The constructor creates a PixelRenderer. After creation it should be
	 * added to the display list of a DisplayObjectContainer to place it on 
	 * the stage and should be applied to an Emitter using the Emitter's
	 * renderer property.
	 */
	public function new( canvas:Rectangle )
	{
		super( canvas );
	}
	
	/**
	 * Used internally to draw the particles.
	 */
	override private function drawParticle( particle:Particle2D ):Void
	{
		_bitmapData.setPixel32( Math.round( particle.x - _canvas.x ), Math.round( particle.y - _canvas.y ), particle.color );
	}
}
